Run results for: leftpad with chatgpt and native

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64; rv:109.0) Gecko/20100101 Firefox/112.0

Browser: Firefox 112

Operating system: Linux

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
leftpad	20028650.0 Ops/sec
chatgpt	16056690.0 Ops/sec
native	17306150.0 Ops/sec

Script Preparation code:

function leftpad (str, len, ch) {
  str = str + "";
  len = len - str.length;
  if (len <= 0) return str;
  if (!ch && ch !== 0) ch = " ";
  ch = ch + "";
  if (ch === " " && len < 10) return cache[len] + str;
  var pad = "";
  while (true) {
    if (len & 1) pad += ch;
    len >>= 1;
    if (len) ch += ch;
    else break;
  }
  return pad + str;
}

function chatGPTLeftPad(string, len, ch) {
  string += "";
  const padding = len - string.length;
  if (padding <= 0) {
    return string;
  }
  const padChar = ch || ch === 0 ? `${ch}` : " ";
  const padString = padChar.repeat(padding);
  return padString + string;
}

function nativeLeftPad(string, len, ch) {
  return string.padStart(len, ch);
}

Tests:

leftpad
leftpad('anim',20,'0')
chatgpt
chatGPTLeftPad('anim',20,'0')
native
nativeLeftPad('anim',20,'0')

Run results for: leftpad with chatgpt and native

blah

leftpad

chatgpt

native